vim-patch:7.4.1640

Problem:    Crash when an autocommand changes a quickfix list. (Dominique)
Solution:   Check wether an entry is still valid. (Yegappan Lakshmanan,
            Hirohito Higashi)

ffec3c5349

src/nvim/version.c

@@ -804,7 +804,7 @@ static int included_patches[] = {
   1643,
   1642,
   1641,
-  // 1640,
+  1640,
   // 1639,
   // 1638,
   // 1637 NA